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Lloyd, the eldest of four children of opera singer Robert Lloyd, grew up in Finchley, London. Having attended a local comprehensive school, he went on to study Physics at Worcester College, Oxford and drama writing with playwright Bernard Kops while supporting himself working in the cloakroom of the Royal Opera House, Covent Garden.
In 1995 his first play, Taking Pictures, was a winner in the New London Radio Playwrights Festival.
The following year he won BBC Television's Double Exposure screenwriting award for his 60 minute television play, A Relative Stranger, which was first broadcast on BBC2 in 1996 starring Siobhan Redmond (Alison Fraiman), Suzanna Hamilton (Jenny Bell), Ioan Gruffudd (Nigel Fraiman) and Jason Isaacs (Peter Fraiman).
Dead Certain, his first stage play, was first produced in 1999 at the Theatre Royal, Windsor and starred Jenny Seagrove (Elizabeth) and Steven Pinder (Michael). It has since received a number of further productions in the UK, New Zealand, Singapore and the US.
In 2001 Marcus's screenplay Cuckoo won the prestigious Oscar Moore Foundation Screenwriting Prize and the award, presented by patron Emma Thompson, enabled him to devote himself full time to writing.
Since then, he has been commissioned to write a screenplay entitled Wake Up Dead for Stephen Garrett and Paul Webster at Kudos Film & Television and is currently at work on a screen adaptation of Brian Aldiss's classic science fiction story, Non-Stop.
Other work includes the radio plays Vacant Possession and The True Story of Mr. Box.
- Taking Pictures (1995)
- A Relative Stranger TV (1996) 
- Vacant Possession (1997)
- The True Story of Mr Box (1998)
- The Front to Back Toy Shop
- Dead Certain (1999) ISBN 0-85676-239-3 
- Cuckoo (2001)
- Wake Up Dead (2006)